I've moved on from OSX Mavericks to OSX Yosemite.
I started off with Snow Leopard in 2010 and been through both Lion and Mountain Lion, and Mavericks. With Lion I had to put another 2GB RAM into my white MacBook to speed it up, but Yosemite is so quick I might as well go back to 2 GB RAM and give the rest to the poor.
It seems Apple has worked on speed this time and I like that. The dashboard first load happens so fast you hardly notice it. Returning from power-saving mode with WiFi turned off takes only a few seconds, a huge improvement. With Mavericks, I sometimes had to turn off WiFi and then turn it back on to get it working. The Dock, with all the app-icons, looks like the one on iPhone. All my favorite programs start up, except Gimp the graphics program. After downloading a new version (2.8) it worked too. Some programs I've tried that are clearly better are Gimp, Mail, iPhoto and Maps and probably a whole lot more I haven't tried yet.
Put shortly: Yosemite is great! If you're running OSX Mavericks, it's time to switch.
Anyway I need to keep up with Apple's relentless improvements or else I'll soon be stuck with a programming environment, which can't make apps for Apple's new devices. I studied their new programming language this winter, called Swift. I like it. It's going to improve the life expectancy of keyboards: it's laconic, hence great for northern, ehum ..., viking types like me. The encounter resulted in the birth of an app, which I hope to see in the App Store next week. I'll send out a ping when it happens.
Took the lawnmower for a spin yesterday. Looked at it for several seconds before I could find the starter cord - must have been a long winter. It started on second crank, which is not bad. It's going to be a long hot summer I hope. We got them sparely in the last couple decades, but there must be a blip on the curve coming.